Electromagnetic cutting-tool.



LE ROY T. BUNSALL.

ELBGTROMAGNBTIG CUTTING TOOL.

APPLICATION FILED 15113.22, 1909.

998,564, l Patented July 18, 1911.

UNITED STATES PATENT oEEicE.

LE ROY T. BONSALL, OF CHARLESTON, WEST VIRGINIA, ASSIGNOR 0F ONE-THIRDTO ARCHIBALD A. KRIEG, OF CHARLESTON, WEST VIRGINIA.

ELECTROMAGNETIC CUTTING-TOOL,

To all whom t may concern.'

Be it known that I, LE ROY T. BONSALL, a citizen of the United States,residing at Charleston, in the county of AKanawha and State of lVestVirginia, have invented new and useful Improvements in ElectromagneticCutting-Tools, of which the following is a specification.

This invention relates to clectro-magnetically-'operated tools, andparticularly to a coal pick or cutter adapted to be actuated byelectro-magnetic operating means.

One object of the invention is to provide a simple, strong, durable, andcomparatively inexpensive construction of tool of this character whichis eicient in action and under' the thorough control of the operator.

Aiother object is to provide a tool which when set in action willcontinue to operate automatically until thrown out of action, or untilthe bit strikes an unusually hard object through which it cannot cutwithoutliability of injury thereto, when the motion of the tool will bearrested and its action may be manually controlled as circumstancesrequire.

The invention consists of the features of construction, coinl'iinationand arrangement of parts hereinafter fully described and claimed,reference being had to the accompanying drawing, in which .Figure 1 is alongitudinal section of atool proper, its supporting truck or carriagebeing omitted. Fig. is a bottom plan. View of the switch mechanismthereof.

Referring to the drawing, 1 designates a suitable frame or casing ofmagnetic material, including in its construction front and rear endheads 2 and 3 and a central chainber or con'ipartment 4, the latterbeing formed between spaced magnetic partitions 5 and t3,

lithin the forward portion of the easing between the head 2 andpartition 5 is inclosed a solenoid 7, and similarly arranged within therear portion of the easing bctween the head 3 and partition t3 is asolenoid 8. i

'lhe heads and partitions are perforated for the passage of a'reciprocating plunger 9 composed of a pair of cores l() and ll of ironlor other suitable material which are suitablil mounted in the usualmanner in the solenoids 7 and S and influenced when said solenoifls areenergized to move the plunger forwardly and backwardly. The two coresSpecification of Letters Patent.

Application filed March 22, 1909.

Patented July 18, 1911.

serial No. 485,060.

10 and 11 are connected by an interposed section or couplingr 12 ofnon-magnetic material, and upon the forward end of the core 10 issuitably secured a non-magnetic head or portion 13 with which isconnected y the cutter-bitl carrying shank or stem 14. Secured upon theheads 2 and 3 are air cushion chambers 15 and 16 or equivalentcushioning devices which check and limit the movements of the plunger atthe ends of its Working and return strokes, and also secured upon thehead 2 is a' frusto-conical tube or sleeve 17 having an opening in itsouter end for the passage of the stem let. and which serves as a guideand brace or support for said stem in `its reciprocating motion.

Supported within the chamber 4 by the partitions 5 and 6 is a guide baror bracket- 18 having a longitudinal guide slot 19, which slot supportsa reciprocating shifter 20 having a guide portion 21 movable within saidslot and terminal tappets or projections 22 and 23. The said shifter isalso provided Ywith an outwardly projecting handle 2t by which it may bemanually adjusted and controlled. Extending from the coupling member l2of the tool plunger is a tappct or projection 25 which is movable inAthe slot 1t) andv adapted to engage the said tappcts or projections 22and 23 upon the shifter, to automatically and alternately slide thelatter backward and forward in the chamber 4.

livotally mounted at their inner ends upon the bracket plate, as at 2G,are swinging circuit closing levers or terminals 2T and 28, which arecoupled .to move in unison by a link 29, theinner ends of said levershcing beveled or rounded for contact with the opposite ends of theswitch shifter, by

which they are adapted to be swung,-

through the reciprocation of the shifter, on their pivotal connections2t) lniekwardly and forwardly in a direction longitudinally of the tool..itt their outer ends the levers 2S respectively carry carbon or othercontacts 30 and 3l which are adapted, by the reva rse movements of Isaidlevers, to engage an intermediate stationary carbon or other cont'aet 52connected witlrone of they lead wires -l of an electric circuitAsupplied with current from any suitable source, the other wire 'i-'t ofwhich circuit'.I is connected by a conductor 35 with both solenoids tooperate as a. common return or ground connection for each, as will bereadily understood.` The yio front contact 30 is connected with thesolenoid 8 by avcouduetor 3G. while the rear contact 3l is connectedwith the solenoid 7 by a conductor 3T. The shifter 2O is of less lengththan the distance between the beveled ends of the switch levers 27-28,so that it has an intermediate inoperative position to cut-ott'connection between both solenoids and the source of electric supply tostoppthe operation of' the tool, and it is adapted, at the respectivelimitsl of its forward and rearward movements, to engage the levers "it"and QS and alternately throw the ,f fontaets T and 3l into engagementwith thclcontact 52, wherebyY the solei'ioids will he alterinatel)venergized and deenernized to project and retract the plunger core.

ln the use of the tool it will be understood thatthe cuttingy bit; isapplied to the i :torward end of the shank or stem 14, the

tool adjusted to bring the bit into cutting position, and said tool thenset into operation by throwing in a cut out switch, not shown, in theline` which will energize whichever solenoid the contact i532 is inconnection with and set the tool into action, the operation thence beingautomatic. Assuming' that the contact 32 is in engagement with contactEl when the line switch is thrown, it. will be apparent that thesolenoid T will be energized to propel the plunger on its forward orcutting' stroke. then the plunger nears the limit ot' its forwardInovenient, its tappet cr projection engages the .tappet Q2 ot' theshi'tter Q0 and moves said shitter 'forward so thatl it will strike. thelever 2T and thus swing the switch levers to throw the contact 3l out.ot' and the contact 2l() into enezugement, with the contact 32, thus.cutting the solenoid T out oil circuit and throwing the solenoid 8 intocircuit for enere-iz/.ation to retract' the plunger. Near the limit oi"its return stroke the tappet Q5 ot the plunger engages the tappet. 23 otthe switch shi't'ter and moves the shifter backward so that. it willstrike the lever 28 and shit't both switch levers to throw the contact30 out. ot' and the Contact 31 into engagement with the contact 32, thusagain energizing the solenoid 7, and this automatic shitting" ot' theswitch bach and l'orth to alternately energize the solenoids 'l'or theautomatic action ot the plunger will continue during.,y the normaloperation of the,tool. ihe operator may, ot course, stop the operationol the tool at` any time by simplythrowiup; out the cuty out switch inthe line,b,ut the tool may be started by adjustingr the shifter Q() bymeans of its handle 2l in case the switch contacts should from any causebe stopped in a neutral position. It on .the cutting motion of theplunger the bit should sti-ikea particularly hard object which it cannot penetrate, thus arresting the plunger and stopping the switchcontacts in a neutral position, the operator may manually shift saidswitch lto etl'ect the retraction of the tool and its subsequentpropulsion on its working stroke, and this action may be continued togovern the operation of the tool until the hard material is cut through,when the automatic action may be resumed. Provision is thus made for thethorough. and effective control of thev tool in operation under any andall conditions of service. The cut out switch will be placed at aconvenient place so as to be easily reached and manipulated by theoperator.

It, will be seen from the foregoing' description that asiniplc,retiicient and reliable type ot' electro-nechanically-operatedtool is provided which may be rapidly operated and idriven by a currentfrom a sto age bat,- tery or other suitable source of supply through theuse oit flexible conductors,which will l-rrnit the vtool to be easilyadjusted and transported from place to place.

HavingVA thus t'ullv described the invention, what is claimed as new, ist A tool of the character described compris in; a casing;- having acentral opening` at one side. thereof. solenoids arranged within theopposite ends oi the said casing, cores operating` therein and connectedto form a plunger, the solenoids being' spaced to form a central chamberin the .casing opposite said opening'. a `ruido b lacket arranged withinthe chamber, a shifter bar mounted to reci-prta-ate upon the bracket andhaving spaced laterally extending tappets and a handle. the. latterprojectingy outwardly through said opening in the side of thecasing', atappct upon the central portion of the plunger tor coaction with thetappets on the shi'tter to alternately move the shifter in oppositedirections, horizontal switch levers eccentrically pivoted on the.bracket and having: their short arms provided with i'eversely beveledend portions adapted :to be.""alter natelv engaged by the ends oit theshifter. a link means coi'inectiug the lone' arms ot. the levers t'orn'iovement in unison, contacts carried by the lone' urn/is ol the leversand electrically connectedfwitliltherespective solenoids. and a niain.cii'ttitit contact arranged between and "adapted y' to be engaged by thea'toresaid contacts, said levers. link and contacts being' inclosed withthe shifter within the central chamber.

ln testimony whereof l aHiX my signature in presence of two witnesses.

LE ROY T. BOSALL. ll/iitnesses:

C. C. Hnins,

JOHN L. FLETCHER.

llt

